Question

In fractional distillation,which fraction leaves the tower at very top?

Answer 1

Answer:

butane and propane at top

Answer 2

Answer: Butane and propane (highly volatile gases) Leave the tower at very top.

Explanation:

• Fractional distillation is the process of separating crude oil into different hydrocarbon products which are useful in different ways.
• The fraction present at the top is the most volatile gas and is also lightweight like butane and propane.
• As the crude oil rises above the temperature falls down facilitating the condensation of gases.
• In the case of heavier gases, they have to further undergo vacuum or steam distillation.